Valve.



H. D. SCHROEDER.

VALVE.

APPLICATION FILED JUNE 16, 1913. l, 1 1 2,564. Patented Oct. 6, 1914.

6717207: Jiraeicr.

- can,

" jectiona 1e noise.

for example,

a partial section to show the operating means.

a @FFICE...

HERMAN D. SCHROEDER, OF LOS ANGELES, CALIFORNIA.

VALVE.

iniaeea.

Specification of Letters Patent.

Application filed June 16, 1913. Serial No. 773,903.

To all whom it may concern:

Be it known that I, HERMAN D. Sermona citizen of the United States,residing at Los Angeles, in the county of Los Angeles and State ofCalifornia, have invented a new and useful Valve, of. which thefollowingis a specification.

This invention relates to a valve which is adapted and intended fordischarging from a supply pipe .a definite quantity of water by a suddenor quick discharge lasting for a short period of time gSuch valve isparticularly adapted for use as a flushing valve in toilet bowls, but itmay also be used as a supply valve for wash bowls, or for otherpurposes. i The main object of the present invention is to so constructthe valve that it Willbe positive and certain in its operation under allconditions of pressure, and will not be subject to sticking or cloggingeven after extended use.

Another object of the invention is to provide a valve of this characterin which the dischar e will be smoothand free from ob- Other objects ofthe invention will appear hereinafter.

The accompanying drawings illustrate an embodiment of the invention, andreferring thereto: Figure 1 is a vertical section of the valve in normalclosed position. Fig. 2 is showing the open position Fig. 3 is a sectionon line 2. Fig. dis a front elevation the valve partly broken away ofthey valve. (c -w in Fig. of a portion of Thevalve comprises a casing 1formed preferably as a spherical shell, having at one side a screwthreaded boss 2 into which screws an inlet pipe 3 for supplying water,and having at another-portion of the casing, at the bottom thereof, ascrew threaded oss 4 to receive a discharge pipe 5 which is connected tothe casing 1 by a 'jstu fiin'g boxconnection comprising a gland. 6screwin into the boss 4: andlcompressing a packing Casing 1 is formedwith an inwardlyf projecting cylindrical-wall 8 forming an'inlet chamber9 which is in line with pply pipe 3,

formed with an inclined or conical valve seat 10, and with a cylindrical11. Opposite ort opening v the inlet cha'm r 9 aforesaid, the casing 1the 7 port opening is provided with an inwardly extending cylindricalwall 12 forming a piston cylinder 12, said wall being provided at itsinner end with an inturned flange 13, and said cylinder 12 being open atitsinner end into'the interior space 1' of casing 1, the said spaceconstituting a surge chamber or discharge chamber for the valve. movablymounted in the aforesaid casing comprises a main valve 15 and a pilotvalve 16'for controlling the operation of said main valve. The mainvalve 15 is formed as a circular head on a tubular stem 17, said stembeing provided with longitudinal ribs 18 orojecting radially andslidably fitting with- 11 aforesaid to support and guide the main valve.Said main valve is also supported and guided by a iston 20, slidablymounted within the cyhnder 12' aforesaid, and secured to the stem 17 ofthe valve, said piston, screwed onto said valve stem. Said piston ispreferably provided with elastic metal packing rings 21 mounted inannular grooves 22 in the piston. The valve member 15 isformed with aninclined or beveled face- 25 for engaging with the inclined valve seat10, and is formed with a cylindrical valve portion 26 to fit the portopening 11 when the valve is closed, the line of junction between saidvalve faces 25 and 26 being grooved as shown at 27 to insure that bothof these valve faces their respective seats without interference byreason of grit, etc. The pilot valve 16 is formed as a beveled head orenlargement on the end of a valve stem 29 extending through the bore ofthe tubular valve stem 17, said stem29being smaller than said bore wasto permit water to flow between stem 29 and wall of said bore when thepilot valve is open, thereby enabling the water to flow from the inletchamber 9a) the space back of the piston 20. l The cylinder 12' isclosed at its outer end by a cover member 30 which may be secured to thecasing adapted'to sup 'prt suitable operating means for the pilot valvestem 29,.fsaidmember 30 being hollowed out or recessed as at 12" toreceive said operating means. ing means may consist of an arm adapted toengage the outer end of the stem 29, said arm bein carried by a shaft 36extending throug a stufiing box 37 atone side of a recessed projection38 on the cow.-

The valve means for example, being may fit tight against S 1 by screws32 and is p said operatmember 3O, said shaft 36 being provided with asuitable handle for example, a U shaped handle 40 secured at one end tosaid shaft and provided at the other end with a stud 41 engaging in asocket 42 in a boss 33 projecting from the member 30 aforesaid. A spring45 engages with the outer end of the tubular valve stem 17, and with acollar or flange 46 on the pilot valve stem 29 so as to tend to hold thepilot valve in closed position. A drainage passage 48 is formed in thecasing 1 leading from the body of the cylinder 12 to a passage 49 whichcommunicates at its inner end with the surge chamber 1 near the outletpipe 5. A screw 50 screws in the said passage 49, and is cut away at oneside as shown at 51 so that by giving said screw a onehalf turn saidduct 48 may be closed or opened, as desired, and in the intermediatepositions of the screws the duct 48 may be partly opened to give anydesired restriction to said duct, enabling the said screw 50 to operateas a bleeding valve for the cylinder 12. -Vent duct 53 is formed on thecasing leading from the cylinder 12 near. the outer end thereof to theupper ort of surge chamber 1, said vent duct eing extremely small indiameter so that it does not interfere with the operation of the pistonin the cylinder by the pressure of the water, but acts only as a gradualvent for any air trappedin the cylinders Main ,valve 15 is provided witha circular head portion or rim 15 which approaches so closely to thewall 8 of inlet chamber 9 as to form a restricted passage 58 betweenthese parts, the port opening 11, even when allowance is made for thespace occupied by ribs 18, being considerably greater in area than saidpassage 58, namely, at least 25 per cent greater.

The operation is as follows: Normally the main valve 15 is in contactwith its seat 10, and the piston 20 1s at the outer end of its stroke.The pilot valve 16. is also closed against its seat, the main vand pilotvalves both being held in closed position by the pressure of the waterin the inlet chamber, this pressure being that which exists in thesupply pipe 3. When it is desired to open the valve, the handle 40 ispushed, causing the valve stem 29 to move longitudinally in the bore oftubular valve 17, and to move the pilot valve 16 away from its seat.Water then flows from the inlet chamber!) through the passage be- 7tween the valve stem 29 and said bore into the space back of the piston20 and said piston 20 being of larger area than the valve member 15, thetotal pressure on the back 7 of the piston is in excess of the pressureon the valve member 15, and the valve member 15 is therefore moved toopen position by the operation of the piston, this movewere morerestricted than th considerable obstruction to the passage of,

the water, and a considerable pressure is thereby maintained on thefront face of the valve member 15, tending to move said valve member toclosed position; this pressure being at the same time communicated, whenthe pilot valve is open, to the space back of the piston, so that aslong--as the pilot valve is open the difference of area of the pistonand the main valve will serve to hold the main valve open, but as soonas the handle 40 of the pilot valve is released, the pressure of thewater on the pilot valve and the operation of the spring 45 serve tomove said pilot valve to closed position. As soon as the water entersthe space,

back of the piston it begins to drain throu h the bleeding valve 48, andas soon as t e pilot valve is closed as above described, this drainageof water from the space back ofthe piston relieves'or reduces thepressure back of the piston, so that the pressure on;

the front of the main valve begins to close the same, this closingmovement being limited or retarded by water back of the piston so thatit can only take place as fast as such water is allowed to escape. Inorder to insure such closmg movement of themaln valve, I have found itnecessary to so -pro-.

portion the parts as above described that while condition of restrictionor obstruction exists, between the main valve member 15 and the wall ofthe inlet chamber so as to maintain the condition of pressure in thefront of the main valve, there is substanno I tially no restriction orobstruction at the port I opening 11 or back of the main valve mem; ber15, this fact being secured by making the effective area of the portopening 11 considerably greater than the efiective area of the passage58 between the main valve member 15 and the wall 8 of the inlet chamber. By reason of this free or'unobstructed discharge of the water backof the main valve member there is no back pressure on this main valve'member tending to overcome the effect of the pressure on the frontthereof, whereas, if the port opening 11 e passage around the valvemember 15, there would be a back dying of t itself through therestricted outlet and due we I pressure due to swirling and ede water inattempting to force I 13o to reflex or-rebound .of the water from therestricted outlet against the back of the main valve. This effect I havefound in practice is. so marked in valves of this ty e that in practicaloperation it renders t e valve inoperative except under especiallyfavorable circumstances. Thus a valve with a restricted outlet may workat a certain pressure, but it will not ivork at a higher pressure, forthe reason that the higher velocities resulting therefrom tend toproduce so much' back pressure on the valve that the valve is preventedfrom closing, particularly after the parts become a little worn, orbecome clogged with grit; By this provision of the free outlet openingand a restricted passage around the main valve before the water reachesthe outlet opening, Iam enabled to. make the valve close with certaintyat widely-varied ranges of pressure, and moreover:

'struction in connection" with the free discharge ofthe outflowing wateragainst the piston, I am enabled to make the operation of the valvesubstantiallyluniform at all pressures for the following reasons: The

V restriction between the valve head and the a P p chamber is projectedinto v velocity, allowing the inlet chamberwall causes all the pressuredue to the restriction to act on the entire head of the valve and theback pressure on this valve" head isfn il, ashereinbefore' explained..The. increased pressure on the valve head and the increase of velocityof the fluid are both inlthesame proportion to the increase in pressurein the supply so that the valve shuts more quickly when the water flowsmore guickly and the quantity of fluid released un er varied pressureswill'be therefore approximately uniform. Furthermore, the inlet chamberand.

the piston chamber project into the spherical chamber directly oppositeeach other, so that the fluid discharged from the inlet the pistonchamber, and strikin the piston,

back around tie inlet chamber into the spherical or surge chamber. Thisproduces a reactive efiect on the piston, tending to force the valve toclosed position and this effect increases with the velocity ofthe'fiuid, so that the valve is closed more rapidly with a higherpressure, thereby further tending to release the same quantity of waterat different pressures. The water refiected from the piston chamber inthis 'manner into the surge jchamber is reduced in over anareaconsiderably larger than the inlet valve, thereby reducmg'the velocityof the fluid and eliminating the noise due to the discharge. Toenablethe water -to freely escape into the discharge or surge chamber afterstriking the piston, it is essential that the walls of the pistonchamber andinletchamber should be 'spaced apart sutficiently by reasonof this conis then reflected discharge to'be spread passage as shown inthe drawing. Any sediment which may accumulate in the bottom of. thepiston chamber is drained off through the bleeding valve and any airthat may accumulate in the upper part of the piston chamber is allowedto escape through the vent duct 53.

'When the main valve is nearly closed, the cylindrical valve portion 26enters the port 11 and closes said port, thereby bringing the full waterpressure on the. valve, bringing it to closed position with a positiveaction without the ,snap and hammer action which would occur if theinclined valve pol: tion were relied on to clear the port, and alsoeliminates the scour on the 'final seating portion, namely the inclinedpiston, of the valve.

What I claim is:

1. A valve comprising a casing'provided with an inlet chamber and-with adischarge chamber and with a port between said inlet chamber anddischarge chamber, said port having a valve seat, a valve memberslidably mounted in said port and adapted to engage to permit freeexposed to the pressure. in said inlet chamher, the eriphery of saidvalve head ortion approac ing the wall of said inlet chamber to form arestricted passage between said periphery and wall throughout the movement of said .valve member and the port opening between said valvemember and its seat being between said restricted passage and thedischarge chamber and being oflarger area substantially throughout the astroke of the valve than said restricted passage so that, pressure dueto obstruction at said restricted passage is maintained on the front ofthe valve member and there is subvalve member, said casing being furtherprovided with a piston chamber opposite said mlet chamber, said pistonchamber being open at its inner end to'communicate with said dischargechamber, a piston in said pis-,

ton chamber connected to said valve member, said piston being of largerarea than said port opening, said valve member being op erated in eitherdirection solely by the difference in pressure on the aforesaid headportion thereof, and I on said piston, said valve member'having alongitudinal borecommunicating at one end with the inlet chamber and atthe other end with the space back of said piston, a pilot valve forclosing the opening of sald bore into said inlet chamher, and providedwith a stem extending through said bore and manually operated meansdirectly engaging said stem to open the pilot valve, said manuallyoperated means being freely movable'in either direction to permit themain valve to be closed solely by the pressure of the water, saidcasing-being further provided with a drainage passage 90 said seat, andhaving a valve head portion 105 stantially no pressure on the back ofsaid 4 25 said casingbeing further leading from the space back of thepiston to the said discharge chamber.

2. A valve comprising a casing provided with an inlet chamber and with adisc arge chamber and with a port between said inlet chamber anddischarge chamber, said'port having a valve seat, a valve memberslidably mounted in said port and adapted to engage said seat, andhaving a valve head portion exposed to the pressure in said inletchamher, the periphery of said valve head ortion approaching the wall ofsaid inlet chamber to form a restricted passage between said peripheryand wall throughout the movement of said valve member and the portopening between said valve member and its seat being between saidrestricted passage and the discharge chamber and being of larger areasubstantially throughout the stroke of the valve than said restrictedpassage so that connected to said valve member, said piston being oflarger area than said inlet chamber, the space between said inletchamber and piston being unobstructed, so that water from the port maystrike the piston, and the head thereof, and on said piston, said valvemember having a longitudinal bore communicating at one end with theinlet chamber and at the other end with the space back of said piston, apilot valve for closing the opening of said bore into said inletchamber, and provided with a stem extending through said bore andmanually operated means directly engaging said stem to open the pilotvalve, said manually operated means being freely movable to permit themain valve to be closed solely by the pressure of the water, said casingbeing further provided with a drainage passage leading from the spaceback of the piston to the said discharge chamber.

In testimony whereof, I have hereunto set my hand at LoslAngeles,California this 11th day of June, 1913.

HERMAN n. so nionnnn;

In presence of ARTHUR P. KNIGHT, MARTHA M. LANGE.

